Abstract
We have made accurate measurements of the phase velocity in liquid3He at 0.6 bar near Tc using a path length modulation technique. The frequency used in this measurement (113 MHz) is much higher than any of the collective mode frequencies and well above the threshold for pair-breaking, ω≫Δ and ω > 2Δ0. We have observed a sharp but small linear increase in the phase velocity below Tc and a small decrease from the expected behavior in the normal fluid region very close to the transition temperature.
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We would like to thank Prof. Sauls for useful discussions. This work has been supported by the National Science Foundatibn Low Temperature Physics Program through DMR-9314025 and DMR-9200671.
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Lee, Y., Hamot, P.J., Sprague, D.T. et al. High frequency acoustic measurements in liquid3He near the transition temperature. J Low Temp Phys 103, 265–272 (1996). https://doi.org/10.1007/BF00754788
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DOI: https://doi.org/10.1007/BF00754788